EP1521399B1 - Procede de communication radio, terminal de communication radio et systeme de reseau local radio - Google Patents

Procede de communication radio, terminal de communication radio et systeme de reseau local radio Download PDF

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Publication number
EP1521399B1
EP1521399B1 EP03738682.8A EP03738682A EP1521399B1 EP 1521399 B1 EP1521399 B1 EP 1521399B1 EP 03738682 A EP03738682 A EP 03738682A EP 1521399 B1 EP1521399 B1 EP 1521399B1
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EP
European Patent Office
Prior art keywords
header
data
radio communication
communication terminal
transmission
Prior art date
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EP03738682.8A
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German (de)
English (en)
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EP1521399A4 (fr
EP1521399A1 (fr
Inventor
Jun Hirano
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Panasonic Intellectual Property Corp of America
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Panasonic Intellectual Property Corp of America
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Publication of EP1521399A4 publication Critical patent/EP1521399A4/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a radio communication method, a radio communication terminal, and a radio (wireless) LAN system.
  • the invention relates to a radio communication method, a radio communication terminal, and a radio LAN system, which have functions to avoid collision of signals between terminals belonging to a radio LAN system.
  • radio LAN Local Area Network
  • IEEE 802.11 IEEE Std 802.11
  • extension standards such as IEEE 802.11e are under consideration in order to carry out the extension relating to QoS (Quality of Service).
  • CSMA/CA Career Sense Multiple Access with Collision Avoidance
  • This CSMA/CA system is a communication system, which makes it possible to avoid collision of transmission data such as back-off by detecting carrier wave (carrier sense) transmitted from other terminal in a radio section when terminals transmit the data in addition to the detection as to whether there is idle space in the channel or not.
  • DCF Distributed Coordination Function
  • PCF Point Coordination Function
  • idle or free time in the radio section is measured (carrier sense).
  • DIFS DCF InterFrame Space
  • signal is transmitted after a certain period of time (idle time + back-off time) in DIFS period.
  • transmission of signal is kept under standby condition for the period of idle time.
  • PCF provides the function to operate while avoiding collision of signals with the other terminals, which occur during DCF.
  • PIFS PCF InterFrame Space
  • DIFS PCF InterFrame Space
  • the priority is given to the operation of PCF over the operation of DCF.
  • the collision of signals between the terminals can be avoided by the communication utilizing polling system.
  • SIFS Short InterFrame Space
  • IFS InterFrame Space
  • a header is added to the data to be transmitted.
  • This header contains essential information for transmitting and receiving of the data between the terminals, such as the information relating to parameters necessary for communication or to extension function.
  • header is added to control information (essential information) relating to a protocol such as control and is transmitted.
  • essential information the information to be known by a plurality of terminals is transmitted, to make sure, by the most redundant method (standard or essential method receivable at all of the terminals) .
  • the data communication on radio section is controlled (e.g. avoidance of collision) by performing temporal control (control of time base), e.g. by providing idle time such as IFS as described above.
  • temporal control control of time base
  • the elapsed time in the radio section can be roughly divided to transmission time of the data to be transmitted and the other time.
  • idle time such as IFS and transmission time of header to be added to the data are included.
  • idle time such as IFS or transmission time of header is called overhead or time required for overhead.
  • Fig. 9 is a schematical drawing to explain the change of ratio of the time required for overhead to transmission time of data in case transmission rate is turned to higher speed in the prior art.
  • Fig. 9 shows the case where, at the transmission rate of 10 Mbps, the ratio of the time required for overhead to the transmission time of data is 1:5. In this case, if the transmission rate is increased from 10 Mbps to 100 Mbps, data transmission time is turned to shorter (quicker), but the time required for overhead is not changed (Transmission time of header is shortened, but here, description is given by neglecting the reduction of transmission time of header). As a result, the ratio of the time required for overhead to the transmission time of data is turned to 2:1. This means that data transmission efficiency to overhead is decreased.
  • Fig. 10 is a schematical drawing to explain the change of the ratio of the time required for overhead to the data transmission time in case data in the prior art is divided.
  • occupying time (occupying ratio) of the overhead in the radio section is increased compared with the case the data is transmitted without dividing to packets.
  • the capacity of the data transmissible within the same time period is decreased, and this means that the throughput of data transmission is decreased.
  • Document D1 ( EP 1 119 153 A1 ) relates to improving the robustness of a communication method in a wireless LAN system (cf. D1 paragraph [0008]). Interference on the communication channel may force a communication terminal to retransmit a packet with a lower data rate as lower data rates are more robust against continuous interference (cf. D1, paragraph [0028]). For adjusting the overall transmission time, the overall payload of the original data packet is fragmented into frames and transmitted separately (cf. D1, paragraphs [0035]-[0036]). All packets are transmitted according to the IEEE 802.11 standard as shown in Fig. 2 (cf. D1, paragraph [0032]).
  • Document D1 refers to a terminal only receiving packets which are directly addressed to the terminal and does not provide a hint towards the terminal receiving data which is addressed to a different terminal as in the invention.
  • Document D2 ( EP 0 893 905 A2 ) relates to a faster transmission of image data in a wireless communication system.
  • each packet Upon transmitting data in multiple communication packets, each packet usually requires a request to send message and a clear to send response prior to sending a data packet (cf. D2, column 1, lines 48-52).
  • the request to send and clear to send message are omitted by a terminal transmitting a second data packet immediately after a first data packet (cf. D2, column 8, lines 7-17).
  • a header portion of the second packet is reduced to only contain a synchronization signal omitting a portion including a partner station ID, a unique word representing the start reception, a status and the checksum (cf. column 8, lines 18-20 and column 1, lines 43-47).
  • document D2 also does also neither describe nor provide a hint towards a terminal receiving data being addressed to a different terminal as claimed in the present application.
  • Fig. 1 is a block diagram to show an embodiment of internal arrangement of a radio communication terminal according to the present invention.
  • a radio communication terminal (may be called hereinafter simply as “terminal") shown in Fig. 1 comprises an antenna 1, receiving means 2, demodulating means 3, communication setting means 4, packet generating means 5, modulating means 6, and transmitting means 7.
  • the radio communication terminal receives a signal transmitted via a radio section by means of the antenna 1 and the receiving means 2.
  • the receiving means 2 performs signal processing as required such as A/D conversion to the receiving signal. Further, the signal after processing is supplied to the demodulating means 3, and demodulation processing is carried out. After the demodulation processing by the demodulating means 3, the data is sent to predetermined processing means (not shown) in the radio communication terminal as receiving data, and the receiving data is always monitored by the communication setting means 4.
  • the communication setting means 4 monitors whether or not information related to reduction of overhead (or suspension of reduction of overhead) is contained in the receiving data or in a header added to it. In case there is information relating to the reduction of overhead, it is judged whether the reduction of overhead should be performed or not according to the information. In case the reduction of overhead should be carried out, a header generation control information to instruct the header generation control (presence or absence of header, and control on the designation of the information to be used as header) is issued, or packet generation/transmission time control information to instruct the control of packet generating time and packet output timing (control of IFS) is issued when the transmission data is converted to a packet to be transmitted to the communication partner.
  • a header generation control information to instruct the header generation control (presence or absence of header, and control on the designation of the information to be used as header) is issued
  • packet generation/transmission time control information to instruct the control of packet generating time and packet output timing (control of IFS) is issued when the transmission data is converted to a packet to be transmitted to the communication partner.
  • the header generation control information and the packet generation/transmission timing control information, to be outputted from the communication setting means 4 are sent to the packet generating means 5.
  • the packet generating means 5 generates and outputs a packet from the transmission data supplied from predetermined data supplying means (not shown) in the radio communication terminal according to the header generation control information or the packet generation/transmission timing control information.
  • the packet outputted from the packet generating means 5 is sent to the modulating means 6, and modulation processing is performed. Further, after modulation processing, the signal is sent to the transmitting means 7. After the signal processing as required, it is transmitted to radio section via the antenna 1.
  • Fig. 2 is a block diagram to show an embodiment of a radio LAN system according to the present invention.
  • Fig. 2A shows an aspect of communication between two terminals
  • Fig. 2B shows an aspect of communication among three terminals
  • Fig. 2C shows an aspect of communication among four terminals.
  • each of a plurality of terminals (these are shown as STA1, STA2, STA3, and STA4 in Fig. 2 ) can carry out radio communication with other terminal on equal basis.
  • each of the terminals can also carry out direct radio communication with other terminal in case the LAN system comprises 5 or more terminals.
  • access point may be installed for the purpose of performing relay when it is not possible to perform direct radio communication between the terminals, to manage common information, to control the entire radio LAN system, or to make connection with external network.
  • Fig. 3 is a flow chart to explain general outline of the operation according to the present invention.
  • Step S200 shifting to communication mode by utilizing the reduction of overhead
  • Step S300 communication by utilizing the reduction of overhead
  • the communication mode by utilizing the reduction of overhead can be voluntarily terminated by a terminal, which performs the communication, and it is also possible to forcibly terminate the communication mode by the other terminal (Step S400: termination). It is further possible to change the method to reduce overhead as arranged in the preliminary stage of communication or to change various types of parameters (Step S500: change). Further, the terminals performing communication may select again the method to reduce overhead or may change various types of parameters and may re-set the communication by utilizing the reduction of overhead (Step S600: re-setting).
  • Step S100 preliminary stage of communication utilizing the reduction of overhead is performed, and the communication by utilizing the reduction of overhead is set.
  • this setting is preferably carried out by taking communication function (communication ability) at each terminal into account. For instance, it is possible to utilize the following conditions at each of the terminals:
  • overhead reduction parameters various types of parameters corresponding to communication function of the terminals
  • each terminal refers to the above condition relating to the terminal of the communication partner and to perform the setting of overhead reduction parameters
  • it is necessary to know and identify communication function of the terminal of the communication partner.
  • it may be designed in such manner that the terminals acquire or exchange the above conditions directly between themselves or to perform mutual setting of overhead reduction parameters.
  • information of each terminals relating to the reduction of overhead may be concentrated to a single terminal (management terminal).
  • Fig. 2B description will be given on a case where the information of each of the terminals relating to the reduction of overhead is concentrated to a single terminal by referring to Fig. 2B .
  • STA2 tries to acquire information relating to the reduction of overhead of STA3 in an arrangement where there are three terminals (STA1, STA2, and STA3) in a radio LAN system.
  • STA2 When STA2 tries to acquire information relating to the reduction of overhead of STA3, request is made to STA1, for instance, to acquire information relating to the reduction of overhead of STA3.
  • STA1 is a management terminal in charge of concentrative management of information relating to the reduction of overhead of each of the terminals or in case communication has been already made with STA3 in advance and the information relating to the reduction of overhead of STA3 has been already acquired
  • STA1 holds the information relating to the reduction of overhead of STA3.
  • STA2 can acquire the information relating to the reduction of overhead of STA3.
  • the terminal (STA2) can acquire communication ability relating to the reduction of overhead of the terminal (STA3) of the communication partner from the terminal (STA1), which is different from the terminal (STA3) of the communication partner.
  • STA2 has no knowledge of the address of the terminal to be communicated (STA3), it is also possible to acquire by requesting the information relating to the reduction of overhead at the same time when it is tried to acquire the address through inquiry by utilizing the technique of WARP (Wireless Address Resolution Protocol) to inquire another terminal (STA1) about the address of STA3.
  • WARP Wireless Address Resolution Protocol
  • Step S200 when the preliminary stage processing of the communication by utilizing the reduction of overhead has been completed, it is shifted at the same time to a communication mode by utilizing the reduction of overhead according to the control by the terminals or by a predetermined management terminal in Step S200.
  • the communication system (HCF: Hybrid Coordination Function) under the standardization by IEEE Std 802.11e may be used.
  • Step S300 description will be given on the communication by utilizing the reduction of overhead in Step S300.
  • the following methods may be adopted:
  • Fig. 4 is a drawing to explain the exchange of the data between the terminals according to the present invention, and it is a schematical drawing to explain the method to add header for each data transmission as required.
  • Fig. 4 the exchange of the data between two terminals (STA1 and STA2 in Fig. 4 ) is shown.
  • STA2 first transmits the data with header to STA1. After Ack (receiving acknowledgment information) has been received from STA1, the data without header is continuously transmitted to STA1.
  • Ack receiving acknowledgment information
  • the data without header is continuously transmitted to STA1.
  • radio communication is performed in a communication mode where Ack can be omitted, it is possible to carry out the method to reduce overhead as described above in such a communication mode by continuously transmitting the data without header instead of receiving Ack at STA2.
  • the number of the predetermined data transmissions is set to 3, and an aspect is shown where the data with header is transmitted at a rate of one in three.
  • the number of the predetermined data transmissions can be set as desired. For instance, when the number of the predetermined data transmissions is set to ⁇ , the data with header is transmitted at first, and all data transmitted thereafter are turned to the data without header.
  • the terminals performing communication with each other can set the number of the predetermined data transmissions in the preliminary stage processing of the communication in Step S100. This makes it possible to select the optimal number of the predetermined data transmissions to match the communication ability of the terminal, and this contributes to the improvement of data transmission efficiency.
  • Step S400 the method to add the header for each predetermined number of data transmissions is terminated in Step S400, and it is turned back to normal communication mode or the communication itself is discontinued.
  • Step S500 it is judged in Step S500 that the change of the setting is needed. Then, the predetermined number of data transmissions to be added with header newly is set again in Step S600, or data transmission is carried out with the updated header added to it.
  • Fig. 5 explains the exchange of the data between terminals according to the present invention, and it schematically shows a method to acquire the header of the data on radio section in advance.
  • Fig. 5 shows the exchange of the data among three terminals (STA1, STA2 and STA3 in Fig. 5 ).
  • STA3 transmits a data with header to STA2, the data with header flows on the radio section. Therefore, the terminal other than STA2 (e.g. STA1), which is the destination of this data with header, can receive this data with header, and STA1 can acquire the header of STA3 from this data with header.
  • STA1 the terminal other than STA2
  • STA1 can acquire the header of STA3 from this data with header.
  • STA3 transmits the data to STA1 without adding the header.
  • STA1 can carry out the processing relating to the processing of the data without the header added to it.
  • STA3 knows that STA1 has already acquired the header of STA3. It is also preferable to notify STA1 in advance that the same header as the header transmitted to STA2 can be used as the data addressed to STA1.
  • the header of the data on radio section is acquired in advance in Step S400 and the method to use the header is terminated. Then, it is turned back to normal communication mode or the communication itself is discontinued. Also, in case the information relating to the header is updated in the middle of the communication, for instance, it is judged in Step S500 that the change of the setting is needed. Then, the updated header is added in Step S600, and data is transmitted.
  • Fig. 6 explains the exchange of the data between terminals according to an example, and it schematically shows a method to utilize identification information as header.
  • Fig. 6 shows the exchange of the data between two terminals (STA1 and STA2 are shown in Fig. 6 ).
  • STA2 transmits information relating to header (header information) to STA1 in advance.
  • the information relating to the header to be transmitted to STA1 can be transmitted as data, and not as a header. Therefore, all types of information (redundant information) to be included in the header of STA2 can be transmitted.
  • STA1 caches the information relating to the header. Further, the information relating to the cached header is associated with the identification information (the information shown as ID in Fig. 6 ). As the identification information, it is possible to allocate arbitrary information. Also, it is possible to utilize predetermined identification information to identify STA2. Then, STA1 notifies STA2 that the information relating to the header of STA2 has been cached, and it also notifies the allocated identification information. It is also possible to carry out the processing up to this moment in the preliminary stage processing of the communication in Step S100.
  • the information relating to the header of STA2 is cached in STA1, and identification information to identify STA2 (i.e. identification information to identify the information relating to the cached header of STA2) is set.
  • identification information is added to the data instead of the header, and data transmission is carried out. It is preferable that the capacity of the identification information is lower than the capacity of the header normally used.
  • STA1 caches the information relating to the header thus received. It may also be designed in such manner that STA1 caches the header added to the data received by normal method (header + data) and allocates the identification information to the header.
  • Step S400 the method to utilize identification information as header is terminated in Step S400, and it is turned back to normal communication mode or the communication itself is discontinued.
  • the information relating to the header is updated, for instance, in the middle of the communication, it is judged in Step S500 that the change of the setting (updating of the information relating to the header cached at the terminal of the communication partner) is needed. Then, in Step S600, the information relating to the new header is transmitted (re-setting).
  • STA2 changes the information relating to header
  • data transmission is performed by adding "identification information + difference of header" (difference between the header before the change and the header after the change).
  • STA1 refers to the sum of "the information relating to the cached header of STA2 + the difference".
  • the method to transmit the difference of header is particularly effective in the communication where the header is changing every moment.
  • the information relating to the header is cached in the terminal of the communication partner in advance and the identification information associated with the information of the cached header is used instead of the header.
  • the header added to the data to mere identification information.
  • the capacity of the overhead is reduced and the transmission time of the header in the overhead is decreased. This contributes to the improvement of data transmission efficiency.
  • Fig. 7 explains the exchange of the data between the terminals according to an example, and it schematically shows a method to reduce IFS immediately after Ack.
  • Fig. 7 shows the exchange of the data among three terminals (STA1, STA2, and STA3 in Fig. 7 ).
  • STA1 receives data from STA2, STA1 transmits Ack (receiving acknowledgment information) to STA2 to show that the data has been successfully received.
  • Ack receiving acknowledgment information
  • IFS is set in normal communication in such manner that radio section is turned to non-signal condition for a certain period of time after the completion of the transmission of Ack.
  • the terminal tries to transmit the data after Ack when Ack has been received, the data is transmitted without idle time immediately after Ack.
  • the terminal of the destination of Ack may be the same as the terminal of the destination of the data immediately after it or may be different from it.
  • Fig. 8 is a schematical drawing to explain the operation after the termination of data transmission in the method to reduce IFS immediately after Ack according to the present invention.
  • the terminal transmitting Ack can continuously transmit the data immediately after Ack as shown in Fig. 7
  • a terminal having this function may preferentially occupy the radio section. Therefore, the longest transmission time of the data transmissible immediately after Ack or the maximum capacity of the data should be set to a predetermined value so that each terminal can use the radio section without causing deviation, and it is so designed that data transmission is terminated if this value is exceeded.
  • Step S500 the change such as the setting of the longest transmission time of the data relating to continuous data or the maximum capacity of the data is needed, for instance, in the middle of communication, the setting is changed (re-setting) in Step S600, and the communication is carried out again.
  • the terminal carrying out the data transmission may voluntarily terminate the data transmission due to the requirements such as time or data capacity after the receiving acknowledgment information, or the data transmission may be forcibly terminated by a predetermined management terminal so that no deviation occurs in the share or the occupying ratio of the radio section of the terminals.
  • IFS is reduced immediately after Ack and the terminal transmitting Ack continuously transmits the data without setting IFS immediately after Ack.
  • the terminal transmitting Ack continuously transmits the data without setting IFS immediately after Ack.
  • data transmission immediately after Ack is voluntarily or forcibly terminated.
  • the deviation in the share or the occupying ratio of the radio section of each terminal can be eliminated.
  • the method to reduce the overhead according to the present invention is not limited to such methods as described above, i.e. a method to add header for each of the predetermined data transmissions, a method to acquire the data on the radio section in advance, a method to utilize identification information as header, or a method to reduce IFS immediately after Ack.
  • the other methods to reduce overhead may be adopted (such as compression of header or omission or shortening of IFS, etc.).
  • a plurality of methods to reduce the overhead may be used, and this makes it possible to carry out the communication with higher efficiency.
  • idle time is provided between the data to be transmitted and received by radio communication terminals on radio section.
  • radio communication in particular, radio communication in accordance with IEEE Std 802.11
  • radio communication terminals can carry out radio communication by reducing transmission time of the header added to the data and/or by reducing idle time.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Claims (24)

  1. Dispositif de réception d'un premier terminal de communication radio dans un système LAN sans fil adapté à une communication radio, basé sur un système TDMA, avec un temps d'inactivité prévu entre les données à transmettre et à recevoir par des terminaux de communication radio, comprenant
    un moyen de réception (2) adapté à recevoir des premières données avec un entête qui est transmis par un deuxième terminal de communication radio à un troisième terminal de communication radio ; i
    ledit dispositif de réception étant caractérisé par :
    un moyen de démodulation (3) adapté à acquérir ledit entête d'après lesdites premières données reçues avec ledit entête, ledit entête autorisant un processus de réception de deuxièmes données sans ledit entête adressé audit premier terminal de communication radio ; et
    le moyen de réception étant adapté en outre à effectuer, dans le cas de la réception desdites deuxièmes données sans ledit entête depuis ledit deuxième terminal de communication radio, un processus de réception desdites deuxièmes données reçues sans ledit entête en utilisant ledit entête acquis à partir desdites premières données avec ledit entête.
  2. Dispositif de réception selon la revendication 1, comprenant en outre un moyen de modification de paramétrage (5) adapté à modifier le paramétrage de communication pour diminuer le temps de transmission d'entête et/ou le temps d'inactivité.
  3. Dispositif de réception selon la revendication 1 ou 2, comprenant en outre :
    un moyen d'acquisition d'aptitude (4) adapté à acquérir une aptitude à diminuer le temps de transmission d'entête et/ou le temps d'inactivité dudit deuxième terminal de communication radio à partir d'un terminal de communication radio différent dudit deuxième terminal de communication radio ; et
    un moyen de modification de paramétrage (5) adapté à modifier le paramétrage de communication pendant ladite communication radio pour diminuer ledit temps de transmission d'entête et/ou ledit temps d'inactivité en se référant à ladite aptitude.
  4. Dispositif de réception selon l'une des revendications 1 à 3, dans lequel
    ledit moyen de réception (2) est adapté à recevoir des données avec ledit entête pour chacune des transmissions de données prédéterminées ; et d'autres données sans ledit entête.
  5. Dispositif de réception selon la revendication 4, comprenant en outre un moyen de paramétrage de nombre (4) adapté à déterminer le nombre desdites transmissions de données prédéterminées lorsque ledit entête est ajouté dans le paramétrage de communication.
  6. Dispositif de réception selon l'une des revendications 1 à 5, comprenant en outre :
    un moyen d'association d'informations d'identification (2, 3) adapté à associer des informations d'identification pour identifier ledit deuxième terminal de communication radio avec des informations relatives audit entête ; et
    un moyen de transmission (5, 6, 7) adapté à transmettre lesdites informations d'identification audit deuxième terminal de communication radio.
  7. Dispositif de réception selon l'une des revendications 1 à 6, dans lequel
    ledit moyen de réception (2) est adapté à recevoir des informations relatives audit entête en tant que données ; et des données ajoutées par la suite avec des informations d'identification prédéterminées provenant dudit deuxième terminal de communication radio, lesdites informations d'identification prédéterminées étant associées avec ledit entête.
  8. Dispositif de réception selon la revendication 7, comprenant en outre un moyen de paramétrage d'informations d'identification (4) adapté à régler lesdites informations d'identification avec ledit deuxième terminal de communication radio.
  9. Dispositif de réception selon l'une des revendications 1 à 8, comprenant en outre un moyen de transmission (5, 6, 7) adapté à, lors de la réception de données, transmettre des informations d'acquittement pour avertir que lesdites données reçues ont été correctement reçues, puis à transmettre les données.
  10. Dispositif de réception selon la revendication 9, comprenant en outre un moyen de fin de transmission (4) adapté à terminer la transmission desdites données suivant lesdites informations d'acquittement selon une condition prédéterminée.
  11. Dispositif de réception selon l'une des revendications 1 à 10, dans lequel on utilise une communication conforme à la norme IEEE 802.11 en tant que dite communication radio.
  12. Dispositif de transmission d'un premier terminal de communication radio dans un système LAN sans fil pour communication radio, basé sur un système TDMA, avec un temps d'inactivité prévu entre les données destinées à être transmises et reçues par des terminaux de communication radio,
    ledit dispositif de transmission comprenant :
    un moyen de génération (5) adapté à générer un entête destiné à être ajouté à des premières données qui sont transmises à un deuxième terminal de communication radio ;
    un moyen de transmission (5, 6, 7) adapté à transmettre lesdites premières données avec ledit entête audit deuxième terminal de communication radio ;
    le dispositif de transmission étant caractérisé en ce que :
    le moyen de génération est adapté en outre à générer des deuxièmes données pour transmission à un troisième terminal de communication radio sans entête ; et
    le moyen de transmission (7) est adapté en outre à transmettre lesdites deuxièmes données sans ledit entête audit troisième terminal de communication radio ;
    de sorte que ledit entête desdites premières données, lorsqu'elles sont également reçues par le troisième terminal de communication radio, permet au troisième terminal de communication radio d'exécuter un processus de réception des deuxièmes données sans ledit entête adressé audit troisième terminal de communication radio.
  13. Dispositif de transmission selon la revendication 12, comprenant en outre un moyen de modification de paramétrage (5) adapté à modifier un paramétrage de communication pour diminuer le temps de transmission d'entête et/ou le temps d'inactivité.
  14. Dispositif de transmission selon la revendication 12 ou 13, comprenant en outre :
    un moyen d'acquisition d'aptitude (4) adapté à acquérir une aptitude à diminuer le temps de transmission d'entête et/ou le temps d'inactivité dudit deuxième terminal de communication radio à partir d'un terminal de communication radio différent dudit troisième terminal de communication radio ; et
    un moyen de modification de paramétrage (5) adapté à modifier un paramétrage de communication pendant ladite communication radio pour diminuer ledit temps de transmission d'entête et/ou ledit en d'inactivité en se référant à ladite aptitude.
  15. Dispositif de transmission selon l'une des revendications 12 ou 14, dans lequel ledit moyen de transmission (7) est adapté à transmettre des données avec ledit entête pour chacune des transmissions de données prédéterminées et d'autres données sans ledit entête.
  16. Dispositif de transmission selon la revendication 15, comprenant en outre un moyen de paramétrage de nombre (4) adapté à régler le nombre desdites transmissions de données prédéterminées lorsque ledit entête est ajouté dans le paramétrage de communication.
  17. Dispositif de transmission selon l'une des revendications 12 à 16, comprenant en outre un moyen de réception d'informations d'identification (2, 3) adapté à recevoir des informations d'identification pour identifier ledit premier terminal de communication radio depuis ledit troisième terminal de communication radio, lesdites informations d'identification étant associées avec des informations relatives audit entête par ledit troisième terminal de communication radio.
  18. Dispositif de transmission selon l'une des revendications 12 à 17, dans lequel ledit moyen de transmission (7) est adapté à transmettre des informations relatives audit entête en tant que données ; et des données ajoutées par la suite avec lesdites informations d'identification prédéterminée audit troisième terminal de communication radio, lesdites informations d'identification prédéterminées étant associées audit entête.
  19. Dispositif de transmission selon la revendication 18, comprenant en outre un moyen de paramétrage d'informations d'identification (4) adapté à régler lesdites informations d'identification avec ledit troisième terminal de communication radio.
  20. Dispositif de transmission selon l'une des revendications 12 à 19, dans lequel ledit moyen de transmission (7) est adapté à, lors de la réception de données, transmettre des informations d'acquittement pour avertir que lesdites données reçues ont été correctement reçues, puis à transmettre les données.
  21. Dispositif de transmission selon la revendication 20, comprenant en outre un moyen de fin de transmission (4) adapté à terminer la transmission desdites données suivant lesdites informations d'acquittement en fonction d'une condition prédéterminée.
  22. Dispositif de transmission selon l'une des revendications 12 à 21, dans lequel on utilise une communication conforme à la norme IEEE 802.11 en tant que dite communication radio.
  23. Procédé de réception exécuté par un premier terminal de communication radio dans un système LAN sans fil pour communication radio sur la base d'un système TDMA avec un temps d'inactivité prévu entre les données à transmettre et à recevoir par des terminaux de communication radio, ledit procédé de réception étant caractérisée par les étapes consistant à :
    recevoir des premières données avec un entête qui est transmis par un deuxième terminal de communication radio à un troisième terminal de communication radio ;
    acquérir ledit entête depuis lesdites premières données reçues avec ledit entête, ledit entête autorisant un processus de réception de deuxièmes données sans ledit entête adressées audit premier terminal de communication radio ; et
    dans le cas de la réception de données sans ledit entête depuis ledit deuxième terminal de communication radio, exécuter un processus de réception desdites deuxièmes données reçues sans ledit entête en utilisant ledit entête acquis à partir desdites premières données avec ledit entête.
  24. Procédé de transmission exécutée par un premier terminal de communication dans un système LAN sans fil pour communication radio sur la base d'un système TDMA avec un temps d'inactivité prévu entre les données destinées à être transmises et reçues par des terminaux de communication radio, ledit procédé de transmission comprenant les étapes consistant à
    générer un entête destiné à être ajouté à des premières données qui sont transmises à un deuxième terminal de communication radio ;
    transmettre lesdites premières données avec ledit entête audit deuxième terminal de communication radio ;
    ledit procédé de transmission étant caractérisé par l'étape consistant à :
    transmettre les deuxièmes données sans ledit entête au troisième terminal de communication radio ;
    de sorte que ledit entête desdites premières données, lorsqu'elles sont également reçues par un troisième terminal de communication radio, permet au troisième terminal de communication radio d'exécuter un processus de réception des deuxièmes données sans ledit entête adressé audit troisième terminal de communication radio.
EP03738682.8A 2002-07-08 2003-07-04 Procede de communication radio, terminal de communication radio et systeme de reseau local radio Expired - Lifetime EP1521399B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002199227A JP4108390B2 (ja) 2002-07-08 2002-07-08 無線通信方法及び無線通信端末並びに無線ｌａｎシステム
JP2002199227 2002-07-08
PCT/JP2003/008522 WO2004006508A1 (fr) 2002-07-08 2003-07-04 Procede de communication radio, terminal de communication radio et systeme de reseau local radio

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EP1521399A1 EP1521399A1 (fr) 2005-04-06
EP1521399A4 EP1521399A4 (fr) 2010-10-13
EP1521399B1 true EP1521399B1 (fr) 2015-09-02

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EP (1) EP1521399B1 (fr)
JP (1) JP4108390B2 (fr)
CN (1) CN100350773C (fr)
AU (1) AU2003246273A1 (fr)
WO (1) WO2004006508A1 (fr)

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US7894343B2 (en) * 2003-06-19 2011-02-22 Polytechnic University Packet sequence maintenance with load balancing, and head-of-line blocking avoidance in a switch
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JP4326557B2 (ja) * 2006-11-08 2009-09-09 フェリカネットワークス株式会社 無線通信システム、情報通信端末、携帯電話、リーダライタ、通信方法およびコンピュータプログラム
JP2010035224A (ja) * 2009-11-09 2010-02-12 Toshiba Corp 無線伝送システムの伝送方法
WO2012020794A1 (fr) * 2010-08-11 2012-02-16 日本電気株式会社 Système de communication, dispositif de transmission, dispositif de réception, procédé de communication et programme d'ordinateur
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Publication number Publication date
EP1521399A4 (fr) 2010-10-13
WO2004006508A1 (fr) 2004-01-15
AU2003246273A1 (en) 2004-01-23
US20050201314A1 (en) 2005-09-15
JP4108390B2 (ja) 2008-06-25
CN100350773C (zh) 2007-11-21
EP1521399A1 (fr) 2005-04-06
JP2004048115A (ja) 2004-02-12
CN1669273A (zh) 2005-09-14
US7804813B2 (en) 2010-09-28

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